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Which conclusion follows from an out of specification castor reading?

  • A.Worn tyres
  • B.Incorrect ride height only, which raises or lowers the suspension arms and therefore alters the measured angle
  • C.Structural or suspension damage
  • D.A need to adjust the track rod, which is the means by which the castor angle is corrected on most vehicles

Answer: C

Since castor is generally not adjustable, an error means something is bent or a mounting has moved. Ride height does affect the reading, so it is checked first, but a genuine error requires structural investigation. Both sides are compared to identify the damaged one. Tracing the requirement back to the physical constraint that produces it makes the answer follow. A symptom that appears under one condition and not another is what narrows the diagnosis quickly.

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